Drainage bag

ABSTRACT

A bag for use in a closed urinary drainage system in which one wall of the bag is faced inwardly with a thin liner sealed to said wall around its entire periphery, the space between the liner and the second wall of the bag being in communication with the drainage tube and unvented while the space between the liner and the first wall is freely vented to atmosphere.

United States Patent Martin Moaeatere, Jr.

Lebanon;

Vincent L. Valllaleonrt Llringloa, both 0!, NJ.

July 8, 1969 July 20, 197! C. I. lard. he.

Murray Hill, NJ.

Inventors Appl. No. Filed Patented Assignee 1111111141101: no 4 Claims,4 Drawing F1 11s. (:1. 150/1, l28/275, l28/DIG. 24 1111. (:1 use 31/00Field 0! Search 150/1, 8; 128/275, 010. 24; 229/53, 56; 222/94 [56]leteraloas Clad UNITED STATES PATENTS 2,930,423 3/l960 Cunningham 222/94300L565 9ll96l Beach ISO/l 3,l 70,600 2/ I965 Pierson.... 222/943,4l5,299 1211968 Hinlnan ISO/l X Primary WW F. Norton Attorney-W.Saxton Seward ABSTRACT: A bag for nae in a closed urinary drainagesystem in which one wall of the bag is faced inwardly with a thin linersealed to said wall around its entire periphery, the space between theliner and the second wall of the bag being in communication with thedrainage tube and unvented while the space between the liner ad theflr'ltvall is freely vented to atmosphere.

PATENTED JUL 20 I971 HV VIL N'IUR S MARTIN MONESTERE,Jr. BY v. L.VAlLLANCOUR Ila-6Q Mu? float ATTORNEYS (PRIOR ART) DRAINAGE BAG In thedesign of closed system drainage bags, an important requirement is toobtain a system in which the air space above the accumulating liquid ismaintained at all stages at atmospheric pressure. This condition should,ideally, be attained without allowing entry of outside air.Commercially, however, it has been considered essential to compromiseeither by completely sealing off the bag (regardless of pressurevariations), or by providing a vent near the top of the bag to maintainatmospheric pressure in the bag during filling. Such vents contain wadsof cotton, rayon or other material, as a filter, and suffer from thedisadvantage that, once the filter is wetted, it presents a highresistance to air flow and prevents the vent from functioning properly.A vented bag of the type just described is shown, for instance, inGovernment U.S. Pat. No. 3,3I2,22l.

An object of the present invention is to provide a closed drainage bag,having no vent, but in which the pressure above the accumulating liquidis atmospheric, this result being at tained by the use of a diaphragm onone wall of the bag, one side of the diaphragm being open to theatmosphere.

A practical embodiment of the invention is shown in the accompanyingdrawing, wherein:

FIG. I represents a rear elevation of a drainage bag with drip chamberinlet and bottom outlet;

FIGS. 2 and 3 represent vertical sections on the line ll-Il of FIG. Ishowing difierent stages of bag filling, and

FIG. 4 represents a vertical section of a closed nonvented bag, toillustrate the creation of adverse presure conditions which are overcomeby the use of the present invention.

Referring to the drawing, the bag I is of customary form, having frontand back walls, 2, 3 of clear flexible plastic (e.g., 0.012 inch vinyl),an inlet opening in which is sealed the lower end of a drip chamber 4,with drainage tube 5 connected to the upper end of the chamber, andbottom outlet tube 6 closed by a clamp 7. The walls 2, 3 are sealedtogether peripherally with provision at the top for an open sleeve 8 towhich a suitable support may be attached as shown, for instance, inSerany et al. u.S. Pat. No. 3,37 l ,897.

An inner liner 9, which may be a sheet of 0.00] inch vinyl, is sealed tothe lower part of the backwall 3 along the line 10, and to the upperpart of the backwall 3 along the line I], and has its vertical edgessealed in the side seams l2, 13 between the edges of the walls 2 and 3.Just below the line II the wall 3 is provided with an opening or vent I4so that the space, if any, between the wall 3 and liner 9 is in opencommunication with the atmosphere. Additional vents may be provided, ifdesired.

To explain the operation of the improved bag of FIGS. l to 3, referenceis made first to FIG. 4, showing a nonvented bag IS in which the liquid16 has risen to the level 11, above which the space I contains whateverair may have been introduced when the system as initially installed orsubsequently. The liquid I distends the lower part of the bag, but thelimited quantity of air in the space ll does not permit expansion of theupper part to the "teardrop" profile which would be assumed by a ventedbag; the upper parts of the walls, in trying to expand, reduce the airpressure in the space below below atmospheric and this negative pressureis communicated through the system to the patient, with adverse effects.

In the bag I of FIGS. l, 1 and 3, a quantity of liquid I9 distends thelower parts at the walls 2 and 3, as in FIG. 4, but the upper parts ofthe walls lie in positions of equilibrium, the air above the liquid inspace 2. being maintained at substantially atmospheric pressure as thethin liner 9 moves readily to a position spaced from the wall 3, withair at atmospheric pressure flowing into the space 2| through the ventI.

When the liquid reaches the level indicated in FIG. 3, the space 2]hasbeen reduced to zero and the bag should be emptied to prevent thepremure in space 20 from rising to a point here drainage would beinterfered with.

It the bag is of substantially rectangular form (rather than shaped atthe bottom to improve drainage and/or provided with the sleeve I or thelike for suspension) the upper and/or lower edges of the liner could, ifdesired, be sealed to the upper and/or lower edges of the walls, as inthe case of the side edges I2, l3. A simple rectangular bag is shown inGarth US. Pat. No. 3,2l7,770.

What we claim is:

I. A drainage bag comprising from and back vertical walls of flexibleliquid impermeable plastic material peripherally sealed together, aninlet opening adjacent the upper edge of said walls and an inner linerof flexible liquidimperrneable plastic material sealed throughout itsperiphery to the inner surface of one of said walls said liner andcovering at least a major portion of said surface, said one wall beingprovided with a vent within the bounds of said major portion.

2. A drainage bag according to claim I in which the liner issubstantially rectangular and has its upper and lower edges sealed tosaid one wall along lines adjacent to but spaced from the upper andlower edges of said walls respectively.

3. A drainage bag according to claim 2 in which the side edges of theliner are sealed between the side edges of said walls.

4. A drainage bag according to claim I in which the thickness of theliner is a small fraction of the thickness of the walls.

1. A drainage bag comprising front and back vertical walls of flexibleliquid impermeable plastic material peripherally sealed together, aninlet opening adjacent the upper edge of said walls and an inner linerof flexible liquid impermeable plastic material sealed throughout itsperiphery to the inner surface of one of said walls said liner andcovering at least a major portion of said surface, said one wall beingprovided with a vent within the bounds of said major portion.
 2. Adrainage bag according to claim 1 in which the liner is substantiallyrectangular and has its upper and lower edges sealed to said one wallalong lines adjacent to but spaced from the upper and lower edges ofsaid walls respectively.
 3. A drainage bag according to claim 2 in whichthe side edges of the liner are sealed between the side edges of saidwalls.
 4. A drainage bag according to claim 1 in which the thickness ofthe liner is a small fraction of the thickness of the walls.